• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집
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• pp.1254-1268
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• 2009

정부고속철도 건설계획이 1998년 IMF로 인하여 서울 시흥구간 및 대구$\sim$부산간은 기존 경부선을 이용하여 우선 개통하고, 2단계로 대구$\sim$부산구간을 신설 개통하는 것으로 변경됨에 따라 서울도심 입출구부인 서울$\sim$시흥구간은 고속열차, 일반열차 및 화물열차의 운용운행으로 일반열차 운행횟수 축소로 인한 서비스 저하, 고속철도 서비스 추가 어려움 등으로 동 구간의 신설확장에 대한 지속적인 필요성이 제기 되어 왔으며, 호남고속철도 또한 수서 출발을 위한 강남권 고속철도 건설계획이 경제성 등의 이유로 오송에서 분기하는 것으로 변경됨에 따라 강남권 및 경기남부지역 주민들의 고속철도 서비스혜택의 기회가 박탈되는 결과률 초래하였다. 경부고속철도 개통이후 국가교통체계가 고속철도 중심으로 변화하고 있고, 경부고속철도 2단계 개통, 경전선 및 전라선 복선전칠 완공, 2014년 호남고속철도 개통시 고속열차 추가수요가 발생하나, 서울$\sim$시흥구간의 선로용량 부족으로 고속열차 광명역 출발, 일반열차 운행횟수 축소 등의 파행적인 열차운영이 불가피하므로 이와 같은 문제점을 근본적으로 해소하기 위한 강북구간 (광명$\sim$화전) 의 선로확장과 더불어 강남구간 (수서$\sim$평택)의 고속철도 신설을 추진하여야 한다. 이에 따라 본 고찰에서는 수도권 고속철도 선로확충을 위한 효율적인 열차운영방안, 시설계획 등 고려 하여야 할 사항에 대하여 검토하고자 한다.

• Tribology and Lubricants
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• 제17권4호
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• pp.297-306
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• 2001

Under the condition of variable density and specific heat, maximum pressure, maximum temperature, bearing load, friction and side leakage in high-speed journal bearing operation are examined within some degree of Journal misalignment. The results are compared with the calculation results under the conditions of constant density and specific heat, and variable density and constant specific heat. It is found that the condition of variable density and specific heat play important roles in determining friction and load of Journal bearing at high speed operation.

• 조명전기설비학회논문지
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• 제28권9호
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• pp.60-66
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• 2014

In case of DC railway, value of ESS(Energy Storage System) is already approved. Whereas AC railway system, there are a lot of differences such as system design and operation pattern. Therefore there is doubt about AC ESS usefulness. Especially, regenerative energy can return to the source. So in case of AC 25kV system, it is necessary to consider different operation algorithm compare to DC railway system. In this paper ESS which is installed in AC high-speed railway was introduced. Power consumption pattern of High speed trains were analyzed, proper storage material was reviewed and operation algorithm was suggested. Super capacitor and Battery was used with hybrid type. Super capacitor was used to handle short term energy movement because of its prompt response and battery was used to handle long term energy movement because of its high energy density. Also in case of operation algorithm, phase control method was upgraded compare to voltage magnitude detection method.

• Wind and Structures
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• 제37권4호
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• pp.275-287
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• 2023

Subgrade differential settlement of high-speed railways was a pivotal issue that could increase the risk of trains operation. The risk will be further increased when trains in the subsidence zone are affected by crosswinds. In this paper, the computational fluid dynamics (CFD) model and finite element (FE) model were established, and the data transmission interface of the two models was established by fluid-solid interaction (FSI) method to form a systematic crosswind-train-track-subgrade dynamic model. The risk of high-speed train encountering crosswind in settlement area was analyzed. The results showed that the aerodynamic force of the trains increased significantly with the increase in crosswind speed. The aerodynamic force of the trains could reach 125.14 kN, significantly increasing the risk of derailment and overturning. Considering the influence of crosswind, the risk of train operation could be greatly increased. The safety indices and the wheel-rail force both increased with the increase of the wind speed. For the high-speed train running at 350 km/h, the warning value of wind speed was 10.2 m /s under the condition of subgrade settlement with wavelength of 20 m and amplitude of 15 mm.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.2821-2829
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• 2011

Since the KTX was in operation in 2004, a number of researches on increasing the train speed have been conducted. Currently, the Honam High-speed train system is designed for the operation velocity of 350km/h. The societal demand expects higher operation speed, whereas the existing construction method and design specification are questioned in the KTX operation in the velocity over 350 km/h. In this study, a full-scale model test was conducted to obtain the preliminary data that is necessary to understand deformation characteristics of the reinforced road bed and the subgrade layers. In the full-scale model test, direct arrival seismic tests, crosshole seimic test, in-situ bender element test and sensing bar test were employed to measure the stiffness and deformation of the trackbed. The systematic analysis on the different set of measurements enhances the understanding of the behavior of the trackbed.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2010년도 춘계학술대회 논문집
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• pp.461-469
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• 2010

Up to now, High speed train was widely used in France, Germany and Japan. In korea, High speed train was introduced from France train model and operation was made in year 2004. With this high speed operation Know-How, HSR-350 train was developed with our own technology. And now KTX-II which was made by our own technology are running in commercial line. High speed rolling stock system acceleration technology is train propulsion system and this is composed with traction motor, Power transfer system and auxiliary power system. This paper, introduced the performance of the traction propulsion system and other equipment that has been installed at the KTX-II will be secured.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.229-235
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• 2007

The KTX, which have opened the revenue service in April 2004, is operating in Kyoung-Bu high-speed line and electrified conventional Ho-Nam line, and the more the electrification are enlarged, the more the requirement of operating of high speed train would be increased. In this paper, the result of test run and evaluation on the suitability of operating high speed train in electrified conventional line between Dae-jeon and East Dae-gu was reviewed. Evaluation and analysis was executed in specific categories, such as operation & running performance of the train considering vibration characteristics based on UIC 518, ride comfort and current collection, and response sensitivity of ATS device for signalling from track facility. The result of this running test was evaluated and considered as a good practice for revenue operation of high speed train in electrified conventional line between Dae-jeon and Dae-gu.

• 한국정보처리학회논문지
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• 제7권4호
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• pp.1263-1270
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• 2000

The operation frequency of High-speed Communication System becomes very fast with the advanced technology of VLSI chips and system implementation. There may exist various types of noise sources degrading the signal integrity in this system. The present main system is made of backplane, so faults can be brought whenever a board is removed, replaced or added. This backplane boards testing is a very important process to verify the operation of system. firstly, we model the effects of the internal noises in the High-speed Communication System to the signal line and propose a new design method to minimize these effects. For the design methodology, we derive the characterization value for each mode land them construct the optimal simulation model. We compare the result of own proposing method with that fo the existing methods, through simulation and show that the quality of High-speed Communication System is significantly enhanced. Secondary our proposing BIST for the Backplane Boards Testing is designed to guarantee that there is no fault in the high-speed communication system.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2006년도 추계학술대회 논문집
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• pp.1461-1467
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• 2006

In case of accidents at the line of Seoul-Pusan high speed railway, high speed train should be operated with making a detour by using existing Seoul-Pusan railroad. For Dae-jeon$\sim$Dae-Gu section which has fragile structures, following points are investigated. In operating existing train, train running time is analyzed by the case of only high speed train being in service and the case of high speed train being in service on condition that existing train is operated. Also the possibility about operation on present train headway and train headway that is applicable to operation and vocational problems would be examined.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2017년도 전력전자학술대회
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• pp.150-151
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• 2017

This paper deals with the suppression of subharmonic current oscillation of V/F controlled high speed induction motor drive in turbo blower applications. High speed induction motor has a relatively low stator impedance for high speed operation and therefore the dc link voltage ripple may result in subharmonic current oscillation at the steady state in high speed operation. This paper shows that the subharmonic oscillation is caused by the dc link voltage ripple and also proposes the suppression method, which generates the compensation voltage through the proportional current controller to reduce the subharmonic current oscillation. The simulation and experimental results show that the proposed suppression method reduces the subharmonic current oscillation to the acceptable low level in turbo blower applications.